Comment by yeneek

I already solved this problem for me. I use graphql code generator (https://www.graphql-code-generator.com/) to generate graphql resolvers on BE and angular services on FE. I use MongoDB and database models are written in typescript. I want to manage db models separately from the API. With this approach, I'm type-safe from end to end.

Edit: I forgot mobile. Apollo Android client generates schemas from schema and queries. I've never written iOS app, so I can't recommend anything yet.